Gas-heated furnace



Nov. 22, 1927.

J. DELWICHE GAS HEATED FURNACE' Filed Fg@ 2. 1927 ATTORNEYy Patentes Nev. 2a,- iaav.

' ksi easrinarnn spannen;

Application`1ed"ZFebruary 2,f?1 9272 Serial Ne. `,1651,43

Y particularly with an arrangement `of parts which permits theready `,conversion of an ordinary coal burning furnace into agas burning furnace. y i I5 wg In most furnaces not specially equipped for "burning igas, the `introduction of a gas y heating apparatus involves suitable difficulty,

and ordinarily proves very unsatisfactory. The present invention provides an extremely simple gas burning equipment which may be readily applied tothe ordinary furnace without necessitating'any changes `whatever in the usual furnace construction, or any` expensive alterations. The apparatus is so arranged that the hot circulating airinay be instantaneously heated if desired by substantially the entire heat transferring sur-uw face of the fire box as opposed to the usual methods which involve the production of hot spots in certain sections ofthe lire box walls, while leaving the other `heat-transmitting walls substantially cold.

lVith the above noted and other objects in view, the invention consists incertain novel features of construction and combinations and arrangements of parts, as will be more fully hereinafter set forth and pointed out in the claim. rlhe invention may be `more fully understood from the following descrip tion in connection with the accompanying drawings, wherein- Fig. 1 is a view in vertical section through a hot air heating furnace of the ordinary coal burning type showingr the furnace coni K verted in accordance with the present inventiOn.

Fig. 2 is a transverse sectional view on the line 2-2 of Fig. 1.

l/Vhile I have shown the invention applied to a hot air furnace, it will be obvious 'that it may be `associated with a furnace in which steam, hot'water or other circulating mediums are used.

In the drawings I have used the reference numeral 10 to designate the lire box of a furnace, this fire box being spaced from the outer shell 11 and cooperatively defining` therewith side air spaces` .l2 and an upper air space 13 from which hot is conducted by various pipes 14% to different localities where it is used for heating purposes. Ordinarily the up-draft of air through the air spaces 12, 13 enters through a screen or foraminousinlet plate 15 at the rear lower Dorticnl of `chamber iProducts ofcom# 11" bustion-from the fire boxwarecarried on'V through a pipe.16, damper controlled as at 17. The usual i lire door 18 "permits intro;k duction oicoal` intothe iirefbox `throtugh the opening 18a.: Agrate f structure `lqdivides the tire Lbony fromlthelashf pit4 20. below,i1 and ajslles'` may ,be removedr` through the; 1 usual opening l21, ordinarily serving as a draft opening through .which the air which supports combustion enters the iire box.y

The construction as thus far described, may be in every respect conventional, the present invention ,being more particularly concerned with the provision of novel means for converting a coal-burning furnace of any conventional type into a gasburning a furnace. Y `1 To accomplish this result, I lay a plate19a on top of the grate 19 and` cover this plate with' a mound of ashes 22. The ashes are piled comparatively deep .and preferably heaped up into the general pyramidal form shown. The pile of ashes materially reduces the capacity of the fire box 10, and the ashes and the plate cooperatively prevent any passage of air upwardly through the grate 19.

A mixture of gas and air is conducted into the furnace through a pipe 25 controlled by a suitable valve 26'; this Vpipe entering the ash pit 20 `through the opening 21, passing upwardly through the plate 19a, and having its discharge end projecting for a slight distance above` the apex of the ash heap 22.

The combustible gas, such for instance as ordinary natural gas or producer gas introduced through the pipe 25, is maintained at a comparatively low pressure, and the gas as it discharges from the-upper end of this pipe impinges upon a spreading conical deflector 28. ll/Iember 28 may be carried if desired by supporting arms 29 on a bushing 30 screwed p on to the upper end of the pipe 25.

Vl3refenably the upper surface of the ash heap 22 vis covered with asbestos or similar material. the asbestos being arranged in a series of overlapping segmental sheets 31 which may be conveniently introduced through the fire door 18 at the time the n Ainstantaneously heat aMsi ammngementl of the" paints'y described without departing from theL invention; Hence I do not wish to'- limit myself tol the details set forth, but shall' consider myself at liberty' to Ineke `such changes and' alterations as fairly fall within the spirit and scope' of the appended claim. it I claim:

A furnace including an inner shell dclining :t fi're box and an outer shell cooperating with the inner shell to provide u heat-ing space, a grate structure in the lire box, a mound ot ashes heaped on the grate to prevent 11p-draft through the grate, a gas pipe includ-ing a delivery end projecting upward-ly above the top of the ash mound, andi overlapping segmental sheets of asbestos or the like covering the upper surface of the lash' mound and leaving a, central. openingV for the gas pipe. v

JEAN DELWICHE. 

